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Projects & Publications

National Human Exposure Assessment Survey (NHEXAS) Border Project (1996-2002)

Start Date: 1996 | Completion Date: 2005

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Project Purpose

Project Description

The NHEXAS Border Project is a probability-based survey of the population of Arizona in proximity to the U.S./Mexico Border. The study included the collection of questionnaire data and samples for the measurement of contaminants in the air, house dust, water, food, and soil. Blood and urine samples of the participants were measured for evidence of exposure to environmental contaminants. Samples were collected for classes of pollutants that are potentially harmful to human health, and for which little information on population exposure is available. The pollutant classes include metals, pesticides, volatile organic compounds (VOCs), and polynuclear aromatic hydrocarbons (PAHs). There are multiple sources (air, water, soil, food, dusts, etc.) of exposure to these chemicals. Certain populations, including low-income individuals, minorities, and the biologically susceptible, are potentially at increased risk, so their exposures need to be identified. Further, little is known about temporal and spatial distributions of pollutants, and trends in these distributions.


Expected accomplishments include:

Expected Outcomes

Project Contacts


Univ. of Arizona, EPA

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